Hi Katherine! Sorry for the delay (like 1 year delay!). I was having trouble with comments being pushed to spam and I didn’t have a chance to reply!

Thickened cream and heavy whipping cream are basically the same thing – slight % difference in fat but will work the same. Pure Icing Sugar is the Australian term for Confectioners sugar. However, Icing / Confectioners sugar have been known to be “cut” with corn starch. Make sure you buy 100% or “pure” to ensure you do not get that blend.